What is "paris-bordeaux-paris"

The Paris–Bordeaux–Paris Trail of June 1895 is sometimes called the "first motor race" although it did not conform to modern convention whereby the fastest finisher is the winner. It was a triumph for Émile Levassor who arrived first after completing the 1,178 km race in 48 hours, nearly six hours ahead of the runner-up. However, the official winner was Paul Koechlin, who arrived third in his Peugeot, exactly 11 hours slower than Levassor, but officially the race had been for four-seater cars, whereas Levassor and the runner-up drove two-seater cars.